US4069824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for forming a crescentic joint in a bone
Assignee: Individual
•
Filing: 1976-07-12
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Granted: 1978-01-24
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Expires: 1996-07-12
Abstract
Abstract As part of the process of realigning the distal ends of a bone having an intermediate section of width W, an arcuate osteotomy is performed on the intermediate section using a cutter having an arcuate cutting edge of a diameter slightly greater than W and an arcuate extent of 180°-N°. The blade is oscillated through an arc of approximately N° to form a crescentic joint having a maximum bearing area.
Inventors
- 👤 Robert E. Weinstock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:09
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/16; A61B17/1637; Y; Y10; Y10T; Y10T408/00; Y10T408/39; Y10T408/89; Y10T408/895
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
148 words
A saw adapted to form a crescentic joint in a bone at a section having a width W, comprising: a blade having a circular base section of a diameter slightly greater than W, an arcuate cutting end of the same diameter, the end having a serrated edge forming an arc of approximately 180°-N° formed on a circular semi-tubular section having the same arc, the other end of the semi-tubular section being connected to an intermediate tubular section that fairs out in arcuate extent from a full circle at the base to the semi-tubular section; a bit affixed centrally to the base and projecting therefrom axially in a direction opposite to the cutting end; and a rotationally oscillating drive adapted to receive the bit and oscillate through an arc of substantially N°, whereby the saw is adapted to form a crescentic osteotomy having a bearing surface of approximately 180°.
Claim 2
Dependent Claim
148 words
A saw adapted to form a crescentic joint in a bone at a section having a width W, comprising: a blade having a circular base section of a diameter slightly greater than W, an arcuate cutting end of the same diameter, the end having a serrated edge forming an arc of approximately 180°-N° formed on a circular semi-tubular section having the same arc, the other end of the semi-tubular section being connected to an intermediate tubular section that fairs out in arcuate extent from a full circle at the base to the semi-tubular section; a bit affixed centrally to the base and projecting therefrom axially in a direction opposite to the cutting end; and a rotationally oscillating drive adapted to receive the bit and oscillate through an arc of substantially N°, whereby the saw is adapted to form a crescentic osteotomy having a bearing surface of approximately 180°.
Claim 3
Dependent Claim
22 words
The saw of claim 1 which the blade has a substantially uniform thickness from its tubular base to its arcuate cutting end.
Claim 4
Dependent Claim
44 words
The saw of claim 1 wherein the intermediate tubular section connecting the end to the base has an arcuate extent of 180°-N° over a longitudinally extending section adjacent the end and a full circular section over a longitudinal extending section adjacent to the base.
Claim 5
Dependent Claim
11 words
The saw of claim 1 wherein N is less than 10°.
Claim 6
Dependent Claim
129 words
A saw blade adapted to be used with a rotationally oscillating drive which oscillates through an arc of substantially N°, to form a crescentic joint in a bone at a section having a width W, comprising: a circular base section of a diameter slightly greater than W; an arcuate cutting end of the same diameter, the end having a serrated edge forming an arc of approximately 180°-N° and being formed on a circular semi-tubular section of appreciable longitudinal extent and of the same arc; and an intermediate tubular section connecting the semi-tubular section and to the base that fairs in arcuate extent from a full circle at the base; and a shank affixed centrally to the base and projecting therefrom axially in a direction oppoite to the cutting end.
Claim 7
Dependent Claim
129 words
A saw blade adapted to be used with a rotationally oscillating drive which oscillates through an arc of substantially N°, to form a crescentic joint in a bone at a section having a width W, comprising: a circular base section of a diameter slightly greater than W; an arcuate cutting end of the same diameter, the end having a serrated edge forming an arc of approximately 180°-N° and being formed on a circular semi-tubular section of appreciable longitudinal extent and of the same arc; and an intermediate tubular section connecting the semi-tubular section and to the base that fairs in arcuate extent from a full circle at the base; and a shank affixed centrally to the base and projecting therefrom axially in a direction oppoite to the cutting end.
Claim 8
Dependent Claim
29 words
The blade of claim 5 wherein the tubular section of the blade, including the intermediate section and the cutting edge, has a substantially uniform thickness along its entire length.
Claim 9
Dependent Claim
11 words
The blade of claim 5 where N is less than 10°.
Claim 10
Independent Claim
62 words
The method of performing an arcuate osteotomy in a bone section having a width W, comprising: sawing the bone section with a right, circular, cylindrical tubular blade having a diameter slightly greater than W and an arcuate cutting end formed on the same diameter and having an arcuate extent of substantially 180°-N°, by rotationally oscillating the blade through an arc of N°.
Claim 11
Independent Claim
62 words
The method of performing an arcuate osteotomy in a bone section having a width W, comprising: sawing the bone section with a right, circular, cylindrical tubular blade having a diameter slightly greater than W and an arcuate cutting end formed on the same diameter and having an arcuate extent of substantially 180°-N°, by rotationally oscillating the blade through an arc of N°.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |